SR 05:024 - Laserfiche WebLink

Page 2 November 30, 2004 REVISED SCOPE OF WORK The following additional tasks are required to address the changes in the design requirements for the project. The tasks include design work by LTD Engineering and work by our two subcontractors - Balance Hydrologics performing hydraulic modeling and LSA Associates preparing revegetation plans. Task I - Revise Hydraulic Modeling Elimination of the diversion through the Applied BioSystems property changes the flow in the lower reach of Mission Creek and the upper reach of Sycamore Creek. The HECRAS model will need to be revised to reflect the changed flow conditions. The revised modeling will provide the hydraulic information necessary to revise the grading plans so that sufficient capacity is provided for the 100-year flow. Task 2 - Revise Grading Plans for Mission Creek and Upper Sycamore Creek The change in flow conditions along the lower reach of Mission Creek and the upper reach of Sycamore Creek wilt require changes in the grading plans to make sure the channel contains the 100- year flow without over[opping. The revegetation plans will need to be revised to correspond with the revised grading plans. Task 3 - Revise Grading Plans for Phased Construction The City now plans to construct the project in at least three phases. This necessitates a revision to the drawings and preparation of new drawings for interim construction to make sure flood flow capacity is maintained before completion of the entire project. The revegetation plans will also need to be revised to correspond with the revised grading plans. Eight new drawings are required as a result of this change. Task 4 - Revise Grading Plans to Avoid San Francisco Water Pipeline The City's decision to eliminate grading along the reach of Sycamore Creek adjacent to the City of San Francisco's water pipeline (between 1-680 and the wooden bridge west of 1-680) requires that we prepare a new hydraulic analysis and grading plan for the reach. The revegetation plans will also need to be revised to correspond with the revised grading plans. Four new drawings are required as a result of this revision. Task 5 - Coordinate Stream Channel Design with Bernal Park Plans The City recently retained an architect to develop plans for the Bernal Park. The need to coordinate the design with the park design architect has already required one meeting. Additional meetings, drawing reproduction, drawing revisions and other work is anticipated during the process of developing pians for the stream channel and treatment wetland that are compatible with the park design. Task6 - Meetings Additional meetings with City staff, developers and park architects will be required to coordinate the various changes in the project design and the phasing of the construction. We assume that a maximum of four future meetings will be required. If additional meetings are required, the budget will need to be increased accordingly.